Efficient microwave excitation gas discharge equipment

Abstract

The invention discloses a design scheme of efficient microwave excitation gas discharge equipment. The design scheme is characterized in that a coupling structure capable of switching states is arranged in the equipment; and during ignition, the coupling structure works in a weakly-coupled first state, strong resonance with the resonant frequency the same as the working frequency of a microwave source is formed in a nonlinear device, ignition is smooth, then the coupling structure works in an almost straight-through second state, almost all microwaves generated by the microwave source are absorbed by the nonlinear device, and the equipment can work efficiently. According to the invention, the equipment can be applied to disinfection and sterilization treatment of various gases and liquids, high-brightness and long-service-life illuminating lamps and microwave plasma torches.

Description

technical field [0001] The invention relates to a high-efficiency microwave excitation gas discharge device. Specifically, it relates to a high-efficiency gas discharge device that uses a two-state working coupling structure to realize low-power automatic ignition and work of the gas plasma discharge device. Background technique [0002] Under the action of high-power microwaves, the gas will be ionized, generate plasma and emit light. Electrodeless ultraviolet lamps lit by microwaves have the advantages of high brightness, long life and high luminous efficiency. They can be widely used in air and drinking water sterilization, and can also be used in industrial waste gas and industrial wastewater treatment and other fields. The plasma torch generated by using microwave ionized gas The microwave plasma torch realized by using microwave ionized gas has the characteristics of high temperature, no pollution, and can be quickly started and stopped. It is used in motor vehicle en...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: 1) the insertion loss of the matching circuit is relatively large, which seriously reduces the energy efficiency of the scheme

2) In the commonly used microwave frequency band of 2450MHz, the power capacity of the lumped parameter circuit is relatively small

The application of this solution in the industrial and environmental protection fields is limited by the power capacity

3) For processing errors and parameter errors of components, this solution lacks adjustability, and it is difficult to achieve the best working condition

4) This solution requires the frequency switching of the microwave source during ignition and operation, which increases the manufacturing cost of the microwave source

5) For the current high-power magnetron with the lowest unit power price, due to its wide frequency spectrum and unstable operating frequency, the matching circuit further reduces energy efficiency due to insufficient operating bandwidth

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